USGS Body-Wave Moment Tensor Solution
SANTA CRUZ ISLANDS
13/02/06 01:54:15.29 Epicenter: -10.479 165.772 MW 7.0 USGS MOMENT TENSOR SOLUTION Depth 12 No. of sta: 9 Moment Tensor; Scale 10**19 Nm Mrr=-0.68 Mtt= 2.78 Mpp=-2.10 Mrt= 1.04 Mrp= 0.22 Mtp=-2.95 Principal axes: T Val= 4.32 Plg=10 Azm= 24 N -0.68 74 258 P -3.64 13 117 Best Double Couple:Mo=4.0*10**19 NP1:Strike=251 Dip=88 Slip=-164 NP2: 160 74 -2
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.